For those who cannot see the deleted question, here it is for reference purposes:
Firefox addon (or other tool) for event monitoring [closed]
From the FAQ
You should only ask practical, answerable questions based on actual problems that you face.
Stack Overflow is hailed by many as a great place to get expert answers to programming problems. The success of Stack Overflow, and the entire Stack Exchange platform, is the result of constant, rigorous monitoring of the material that is posted on the network to ensure that it meets the guidelines for Q&A. Stack Exchange is not a traditional forum, and sometimes this catches people off-guard.
As a result of trial and error, sweat, blood, and tears, the community has learned that there are certain types of questions that just aren't a good fit for the Stack Exchange engine. For example, questions asking for recommendations or those asking for lists of things typically don't work well in our communities.
This particular question can actually be closed under two separate close reasons:
Not a Real Question
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or specific expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, see the FAQ for guidance.
What have you tried?
First, the question is overly broad. The asker doesn't state what he/she tried, what research he/she has already done, or provided details about a specific problem. Chances are, a quick Google search could answer this question, which means it's already been answered. There is no need to ask a question for which an answer already exists on the first page of Google. Stack Exchange strives to be more.
Lists are bad:
Second, the question asks for a list of things, which Stack Exchange is really not setup for. The larger the list grows, the more difficult it is to find the items of true value. It morphs into the classic needle-in-a-haystack problem.
Not only that, but it is essentially a shopping question, which tends to encourage posts that list favorite tools rather than a tool that actually solves a problem. There is really no correct answer, and the post has little value to future visitors. You can read more about this in the article Q&A is Hard, Let's Go Shopping.
With that said, closure and deletion aren't designed to make anyone feel bad or tell you your a bad person. Q&A really is hard, and it takes some practice to get it right.
Lastly, I want to point out some more signs that this should be closed as not a real question. Your answer was great considering the severe lack of information, but even at that, the first thing the asker tells you is basically "Sorry, this doesn't answer my extremely vague, unclear question". You gave Firebug as an answer, and explained how to use it, but then the asker tells you he's already using Firebug, and that it won't help.
This is information that, had it been included in the question, would have helped make it a slightly better question. It would still be a list question and subject to closure, but that list would be potentially a lot shorter with a somewhat clearer scope.
The best advice I can offer is to learn to recognize these types of questions, leave guiding comments for users who ask these types of questions, downvote them, and vote to close. In other words, don't waste your valuable time on them. Good luck! :)